code: def valid_iam_role_arn():
      return "arn:aws:iam::555555555555:role/IMRole"
  
imports: from __future__ import absolute_import
  import os
  import pytest
  from mock import MagicMock
label_desc: Use image node_id 3 for calling a global function with example usage: valid_iam_role_arn() and returns: str